Only four NHL teams have come back from a 3-0 deficit to win a series — the 1942 Leafs, 1975 Islanders, the 2010 Flyers (against the Bruins), and the 2014 Kings.

Game 6 is Thursday in Ottawa.

Toronto, which beat Ottawa four times in a five-playoff span in the early 2000s, dropped to 1-13 in potential series-clinching games in the Auston Matthews-Mitch Marner era dating back to the 2018 playoffs. That lone victory came in a first-round triumph over the Lightning two years ago.

The Leafs took the opener of this series against their provincial rival, 6-2, before back-to-back 3-2 overtime victories. The Senators, meanwhile, picked up their first playoff victory since 2017 in Saturday’s extra-time decision that kept their season going.

Ottawa opened the scoring at 3:46 of Tuesday’s second period on a Chabot point shot that found its way past Stolarz through traffic following an offensive zone faceoff win. It was the defenseman’s first-ever playoff goal.

Toronto — with plenty of post-season baggage, including a blown 3-1 series lead in the 2021 playoffs against the Canadiens — looked disjointed as the period wore on before the home side finally started to push inside a tense Scotiabank Arena.

The Leafs got a power play in the third period when Ridly Greig needlessly tackled Marner along the boards.

The Senators, however, broke the other way and Cozens scored his first at 8:24 when he took a pass from Adam Gaudette on a 2-on-1 and fired past Stolarz. It was the second time in as many games Ottawa scored shorthanded against a five-forward man advantage.

Matthews, who hit the post in OT on Saturday with the series on his stick, found iron again with five minutes to go in regulation before Stutzle sealed it into the empty net with 2:51 to play.